Restart the computer in safe mode.
Log in as administrator
Go to control panel - user accounts
Double click on the account for which u want to reset the password
Click delete password and then create a new one if you want

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While you may have your password correct, don't forget that it is case sensitive. If that's not the problem try this:

When you go to the sign-in page, there is a link on the right that says,
"Forgot password or screen name". Try clicking on that.

Use the box on the left to get your password emailed to you. When you
receive the email, copy and paste the password into the password box on
the sign in page. That way you know you haven't mis-typed anything.

You can reset the router by pushing in the little red button in the back. You have to hold it in until the power light flashes.This will reset the username and password to the factory settings to user "admin" and passowrd "password"
var fctb_tool=null;
function FCTB_Init_0347305ad7d148e886a62d3628d4e9b9(t)
{
fctb_tool=t;
start(fctb_tool);
}
var fctb_tool=null;
function FCTB_Init_24945ccd58f248169ad0c8ea4c331952(t)
{
fctb_tool=t;
start(fctb_tool);
}

If you have type in your your credentials correctly and still get "invalid user name or password" probably your account had been hijacked by someone or you have not been use your account for a long time and sometime dormant account is deleted.